In which condition will linking a decline in the birth rate only to government policy be incomplete?

Correct answer: When education, income, health and social awareness are also changing

The correct answer is A. Government policy can encourage smaller families through health services, contraception, awareness programmes and education, but it is not the only influence on birth rate. Step 1: education may increase knowledge of family planning and broaden opportunities, especially for women. Step 2: better income and health can change family decisions and reduce the need to depend on many children. Step 3: social attitudes, age at marriage and access to medical services also matter. Therefore, explaining the decline only through policy ignores important social and economic changes. B actually makes a policy-only explanation more plausible, not incomplete. C is unrealistic because birth rate is a population measure. D concerns movement of people and does not explain all causes of birth-rate decline. Memory cue: birth rate reflects policy plus society, economy, health and education.